Boiler



(No Model.) 2 Sheets-Sheet 1.

P.,& J. J. MEEHAN,

' BOILER. I No. 536,755. Patented Apr. 2, 1895.

XQZZZNES?ZQQ WM 5 (No Model.) I 2 Sheets Sheet 2. P. 82; J. J. MEEHAN.

V BOILER. No. 536,755. Patented Apr. 2, 1895.

Fig.2

3 2 Q I i WITNESSES INVENTORS i awx UNITED STATES PATENT OFFICE.

PATRICK MEEHAN AND JOHN J. MEEHAN, OF NEW CASTLE, PENNSYLVANIA.

BOILER.

SPECIFICATION forming part of Letters Patent No. 536,755, dated April 2, 1895.

Application filed May 2, 1894- Serial No. 509,787. (No model.)

T0 at whom, it may concern:

Be it known that we, PATRICK MEEHAN and JOHN J. MEEHAN, residents of New Castle, in the county of Lawrence and State of Pennsylvania, have invented a new and useful Improvement in Boilers; and we do hereby declare the following to be a full, clear, and exact description thereof.

Our invention relates to steam boilers, and more particularly to that class of boilers known as smoke-flue boilers.

The object of our invention is to provide a smoke-flue boiler in, which the constant circulation of the water is obtained, and also one in which we provide safety-tubes which will burn out when the water in the boiler gets below a certain level, and thus prevent the explosion of the boiler.

To these ends our invention consists, generally stated, in a furnace having a smokeflue boiler arranged therein, a drum within said furnace, a series of ascending watertubes connecting said boiler and drum, said tubes being directly in the path of the products of combustion, and a series of safetytubes leading from the rear end of said drum upwardly and adapted to enter the rear head of said boiler at the water-line just above said: smoke-fines, and a wall interposed between said safety-tubes and the products of combustion; said safety-tubes however being directly exposed to the action of the products of combustion where they enter said boiler, whereby when the water in the boiler falls below the water-line the upper ends of said safety-tubes being exposed to the products of combustion will burn out and prevent the explosion of said boiler.

To enable others skilled in the art to make and use our invention, we will describe the same more fully, referring to the accompany ing drawing in Which Figure 1 is a longitudinal central section of our improved steam boiler, some of the parts being shown in full lines. Fig. 2 is a vertical cross-section on the line 2-2. Fig. 1; and Fig. 3 is a detail cross-section on the line 3-3 Fig. 1. Fig. 4 is a longitudinal section of a portion of a corner and side showing the arrangement of the circulation tubes.

Like letters indicate like parts in each of the figures of the drawings.

As illustrated in the drawings, the furnace at is provided, having the fire chamber b located at its forward end, said fire chamber having the coaling door b, grate bars b ash With said boiler d by the water-tubes f. A.

man-hole e is provided at the rear end of said drum. A Water supply pipe 9 enters the top of the boiler d and communicates with the reservoir g, which is supported in suitable'bracket-s g in the top of said boiler. The upper portion of the reservoir g is provided with the openings 9 which allow for the entrance of steam from the boiler d. The steam thus admitted acts to boil out the sediment from the water within said reservoir so that when the water passes to the drum below the sediment will be immediately deposited at the bottom thereof. Leading from the said reservoir g are the auxiliary pipes g which pass down through two tubes f f of the water tubes f and enter the drum e, whereby the Water is fed to said drum. By having the auxiliary pipes 9 extending down into the drum any dirt or sediment carried into said drum by said pipes will collect at the bottom of said drum, while at the same time the water passing through said pipes g will not. be converted intosteam before it reaches said drum. The ends of the auxiliary pipes g are bent at an angle to the main body thereof as at 9 so that the water passing down through said tubes will not fall with such force as to stir up the sediment within said drum. Furthermore, by having the auxiliary pipes inclosed by the tubesff and subject to high heat, the water in passing through said auxiliary pipes will be raised to the degree of heat of the boiler, so that when the Water arrives at the drum 6 much of the sediment will have been boiled out and will drop immediately to the bottom of said drum, thus leaving the water which is to pass back through said tubes f into the boiler practically clear and free from sediment.

In the rear of the furnace care the safetytubes h which connect the rear boiler head (i with the drum c. up on the outside of the rear wall a of the furnace, being arranged within recesses a in said wall, The upper ends of said safety-tubes are provided with the connections 7a which connect said safety-tubes h with the sections h which enter the boiler at 763. The wall a does not protect these sections 7L2 of said safetytubes, but they are left exposed to the heated products of combustion within the furnace walls. The wall a keeps the safety-tubes h at a lower temperature than the water-tubes f, so that the water passes up from the drum e into the boiler and down from the boiler into the drum through the safety-tubes 72, whereby a constant circulation is maintained. The important function, however, of the tubes h is to allow for the escape of steam when the water in the boiler gets below the water-line. By the water-line we mean the lowest point to which the water can go with safety. For this reason the safety-tubes h enter the boiler at the water-line. When the water in the boiler falls below the water line there will not be any water in the sections it of the safetytubes h where they enter said boiler, and as they are exposed to the direct action of the heated products of combustion, the said section will be burned out. This will permit of the escape of the steam in the boiler and so prevent the explosion of the same.

Connected to the drum e are the tubesi which pass up on the outside of the walls a of the furnace at and enter the boiler d at or about the water-line, said tubes 1' being arranged within recesses t" in said walls. As these tubes 11 perform the function of eircu' lating tubes, they must be kept at a lower temperature than the watertubes f, and for this reason they are protected from the direct action of the heat bypassing up outside said walls a. They may be protected against the action of the heat in other ways and we do not confine ourselves to the particular way shown, in which they are carried up outside the walls of the furnace. These tubes 2', being at or near the waterline, perform the further function of carrying off any dirt or sediment which may collect on the surface of the water within the boiler. In order to blow out the sediment which collects in the drum 6 we provide the pipe connected to the drum by the Ts It. The pipe 7c is provided with the valve Z.

The operation of our improved boiler is as follows: The fire being started in the fire chamber 1) of the furnace at, the products of combustion will come in contact with the water-tubes f, and, passing through the openings between said tubes, will reach the rear end of the furnace, whence they will rise directly to the smoke-fines d of the boiler cl, thence out the front end of the stack or chimney. The water-tubes f, beingin the direct path of the products of combustion, are

Said safety-tubes 72, pass raised to a high heat, but the safety-tubes it, being protected by the wall a are not subjected directly to the heated products, which, when they reach the rear of the furnace, are drawn immediately upward by the draft of the chimney connected with the smoke-flue. The sections 71 however, of said safety-tubes h, where said tubes enter the boiler d, are subjected to a high heat by the products of combustion as they rise to enter the smoke-tubes cl. Meanwhile, water is fed to the water reservoir g through the supply-pipe gin the top of the boiler. The openings 9 in the reservoir g admit steamfrom the boiler which acts to raise the water contained within said reservoir to a high heat, whereby much of the sediment of the water is boiled out before it passes down the auxiliary tubes g In this way, when the water passes down into the drum 6 the sediment having been largely boiled out in the reservoir will be deposited at the bottom of the drum, so that the water passing up the tubesf will be practically free from sediment. As the water-tubes f have been heated by the products of combustion, the water from the drum e will pass up through said water-tubes finto the boiler (Z until it arrives at the proper height therein, which is regulated by means of the ordinary water column and gage cook. The generation of the steam, of course, takes place in the boiler d, but as the water keeps entering said boiler through the water-tubes f, and the tubes h and i are cooler than the water-tubes f, the water passes downward through said tubes h and 71 into the drum 6, whence it again ascends through the water-tubes f, and thus a constant circulation is obtained. In case the water in the boiler d falls below the prescribed water level, the action of the heat upon the sections 77,2 of the safety-tubes h at the point where they enter said boiler will burn out said safety-tubes at that point and give vent for relieving the pressure from the boiler, and

thus prevent the explosion of the same.

When it is desired to clean out the drum e the valve Z in the pipe 70 is opened. The pressure within the drum will force out all the sediment and filth contained therein. By having the two or more exits from the drum, all parts of said drum are thoroughly cleansed and none of the sediment remains in the ends thereof as is the casein blow-offs having only one exit from the drum.

What we claim as our invention, and desire to scan re by Letters Patent, is

l. The combination with a furnace having a fire chamber therein, of a boiler having smoke-fines, a drum, a series of tubes connecting said boiler and drum and exposed to the heated products of combustion, and safetytubes leading from the rear end of said drum upwardly and constructed so as to enter the rear head of said boiler at the water-line just above said smoke-flues,and a wall interposed between said tubes and the heated products of combustion on their way to said smoke fines, said safety-tubes being exposed where they enter said boiler, whereby said safetytubes will be directly acted upon by the heated products entering said smoke-fines, substantially as and for the purposes set forth.

2. The combination with a furnace having a fire chamber therein, of a boiler, adrum beneath said boiler, a series of ascending watertuloes connecting said boiler and 'drum, safetytubes connecting said drum and the rear of the boiler at or about the water-line, a series of descending water-tubes connecting said drum and the sides of the boiler at or about the water-line, and water-feed pipes for supplying the water from the feed-water heater to said drum, substantially as and for the purposes set forth.

3. The combination with a furnace, of a boiler, a drum beneath said boiler, a series of water-tubes connecting said boiler and said drum, and water feed pipes passing down through said water-tubes into said drum, said feed pipes having the lower ends thereof turned at an angle to the main body, substantially as and for the purposes set forth.

4. The combination with a furnace, of a boiler, a drum beneath said boiler, a water reservoir suspended within the steam-space of said boiler, and pipes leading therefrom to said drum, substantially as and for the purposes set forth.

5. The combination with a furnace, of a boiler, a drum beneath said boiler, a water reservoir within the steam-space of said boiler having openings in the top thereof, and pipes leading therefrom to said drum, substantially as and for the purposes set forth.

6. The combination with a furnace, of a boiler, a drum beneath said boiler, a series of water tubes connecting said boiler and said drum, and a blow-off pipe outside of said drum arranged longitudinally of said drum and connected thereto, said drum having two or more exits leading to said pipe, substantially as set forth.

In testimony whereof we, the said PATRICK MEEHAN and JOHN J. MEEHAN, have hereunto set our hands.

PATRICK MEEHAN. JOHN J. MEEHAN. 

